![]() For me, living at the hook, the following features of an anchor alarm app are important: These apps come in a large variety, with many different features, and so it is quite confusing which app to use. ![]() When using this app you will find that the rules of scope, like 3:1, or 5:1, are often rather poor and sometimes even dangerous advice! So, please do have a look and play around with the free online version.Īssuming you have done all that, it is time to set the GPS anchor alarm, i.e., to define an allowed perimeter within which the vessel must stay at anchor and finally arm the alarm. I sometimes dub it as a preventive anchor alarm… □ A free online version of this calculator with slightly reduced functionality is also available. ![]() ![]() It is described elsewhere on my home page: AnchorChainCalculator, and is available for Apple/iOS and Google/Android. For the latter, there is another app that can help you in working out the minimally required anchor chain and/or rope length and the associated anchor load. Of course, using such an anchor alarm does not mean you can neglect any of the other essential tasks and drills when anchoring, such as finding an appropriate anchorage to begin with, fit for any predicted changes in weather, making sure the anchor is properly set, and paying out enough chain and/or rode so as to reduce the anchor load to the minimal value and thus minimise the risk of dragging or worse from the start. Essentially, they raise an audio alarm when the vessel leaves a certain perimeter and thus raise your attention that the anchor may be slipping, and your vessel is dragging. Anchor alarm apps are a rather useful addition to increase the safety at anchor, in particular when you are short-handed and cannot man a full anchor watch.
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